For controlling the speed of an induction motor the supply frequency i – McqOptions

MCQOPTIONS

1.	For controlling the speed of an induction motor the supply frequency is increased by 10%. For maximum toque to remain constant, the supply voltage must
A.	Be increased by 10%
B.	Remain constant
C.	Be decreased by 10%
D.	Be reduced or increased by 20%
Answer» B. Remain constant

Discussion

No Comment Found

Related MCQs

Cogging in an induction motor is caused
In an induction motor, if the number of poles is doubled, the speed will be ______.
From the design perspective, how can the torque of a squirrel-cage induction motor be increased?
If during a no-load test on an induction motor it takes 10 A current and 300 watts of power at a line voltage of 200 V, the stator core loss will be (assume stator resistance /phase as 0.3 Ω)
A three phase induction motor is driving full-load torque which is independent of speed. If the line voltage drops to 90% of the rated value. % increase in motor copper losses
Consider the following statements with regards to an induction motor:1. Maximum torque is independent of rotor resistance.2. Starting torque is maximum when rotor resistance equals rotor reactance.3. Torque is very sensitive to any changes in supply voltage.Which of the above statements are correct?
A 3-phase, 400/200 V, Y— Y connected wound-rotor induction motor has 0.06 Ω rotor resistance and 0.3 Ω standstill reactance per phase. To make the starting torque equal to the maximum torque, the additional resistance required in the rotor circuit will be
For controlling the speed of 3ϕ induction motor, which of the following scheme is used:
_______ is used to support the rotor of an induction motor.
A balanced 3 – phase induction motor runs at slip s. If ωs is its synchronous speed, what is the relative speed between the stator mmf and rotor mmf ?